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7.0 COMPONENTS & CONTROLS
7.2 Power Inverter Compressor
Control
RD17AZ outdoor units are equipped with a power
inverter that varies the compressor speed to match
the changing capacity needs of the conditioned
space. The inverter interfaces with the Universal Out-
door Control (UODC) which communicates the level
of system capacity that is required to the inverter
based on input from the EcoNet
TM
Control Center
or conventional 24VAC 2-stage thermostat. The
inverter converts incoming single phase power to
simulated variable frequency 3-phase power that is
connected to the 3-phase compressor motor. Each of
the four (-)P20 models has a unique inverter specifi-
cally designed and qualified for that specific model to
provide reliable operation under the most extreme
conditions. Each inverter is programmed to monitor,
input current, input voltage, Compressor speed and
Fan speed. When the inverter identifies a condition
that could potentially result in compressor or inverter
damage, it automatically reduces the compressor
speed until a more reliable operating condition is
obtained or shuts the compressor completely off
if necessary. Once safe operating conditions are
attained, the inverter will gradually increase the com-
pressor speed in an attempt to meet the capacity
demand as long as the operating conditions remain
within the safe operating range of the compressor
and inverter.
1. RS485 Communication
2. Input Power
3. Drive Output
4. OD Fan Motor
Components
2/3 Tons 4/5 Tons
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